How do I close my icloud account?

There isn't really any such thing as an iCloud account. iCloud is one of the many services offered by having an Apple ID account. If you wish to delete that then carefully read this document: For information about how to delete your Apple ID account, click here --> How to delete your Apple ID account - Apple Support

If what you really mean is downgrade your iCloud storage to the free level; click on the link to read how to downgrade or cancel your iCloud storage plan on an iOS device, a Mac, or a PC. --> Downgrade or cancel your iCloud+ plan - Apple Support

- "If you don't have one of these devices, contact Apple Support to change your iCloud storage plan." Click here --> Choose your country or region - Official Apple Support Select your country, then a product.

jgcox54911 Said:

"How do I close my icloud account?"

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Closing an "iCloud Account":

There is not "icloud account"? All there officially is, is your Apple ID. So, do you (A.)want to close your Apple ID (in which case you'd lose all purchases? Or do you (B.)want to remove your iCloud Plan?

Download Prior to Closure:

Perform my User Tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Your Apple ID acts as the so-called “iCloud account”, deleting your Apple ID will also remove all your contents from iCloud. Here is how: How to delete your Apple ID account - Apple Support